///*
// *
// * Copyright 2015, Google Inc.
// * All rights reserved.
// *
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// * modification, are permitted provided that the following conditions are
// * met:
// *
// *     * Redistributions of source code must retain the above copyright
// * notice, this list of conditions and the following disclaimer.
// *     * Redistributions in binary form must reproduce the above
// * copyright notice, this list of conditions and the following disclaimer
// * in the documentation and/or other materials provided with the
// * distribution.
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// * contributors may be used to endorse or promote products derived from
// * this software without specific prior written permission.
// *
// * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// */
//
//#include <iostream>
//#include <memory>
//#include <string>
//
//#include <grpc++/grpc++.h>
//
//#include "helloworld.grpc.pb.h"
//
//using grpc::Channel;
//using grpc::ClientAsyncResponseReader;
//using grpc::ClientContext;
//using grpc::CompletionQueue;
//using grpc::Status;
//using helloworld::HelloRequest;
//using helloworld::HelloReply;
//using helloworld::Greeter;
//
//class GreeterClient {
// public:
//  explicit GreeterClient(std::shared_ptr<Channel> channel)
//      : stub_(Greeter::NewStub(channel)) {}
//
//  // Assembles the client's payload, sends it and presents the response back
//  // from the server.
//  std::string SayHello(const std::string& user) {
//    // Data we are sending to the server.
//    HelloRequest request;
//    request.set_name(user);
//
//    // Container for the data we expect from the server.
//    HelloReply reply;
//
//    // Context for the client. It could be used to convey extra information to
//    // the server and/or tweak certain RPC behaviors.
//    ClientContext context;
//
//    // The producer-consumer queue we use to communicate asynchronously with the
//    // gRPC runtime.
//    CompletionQueue cq;
//
//    // Storage for the status of the RPC upon completion.
//    Status status;
//
//    // stub_->AsyncSayHello() performs the RPC call, returning an instance we
//    // store in "rpc". Because we are using the asynchronous API, we need to
//    // hold on to the "rpc" instance in order to get updates on the ongoing RPC.
//    std::unique_ptr<ClientAsyncResponseReader<HelloReply> > rpc(
//        stub_->AsyncSayHello(&context, request, &cq));
//
//    // Request that, upon completion of the RPC, "reply" be updated with the
//    // server's response; "status" with the indication of whether the operation
//    // was successful. Tag the request with the integer 1.
//    rpc->Finish(&reply, &status, (void*)1);
//    void* got_tag;
//    bool ok = false;
//    // Block until the next result is available in the completion queue "cq".
//    // The return value of Next should always be checked. This return value
//    // tells us whether there is any kind of event or the cq_ is shutting down.
//    GPR_ASSERT(cq.Next(&got_tag, &ok));
//
//    // Verify that the result from "cq" corresponds, by its tag, our previous
//    // request.
//    GPR_ASSERT(got_tag == (void*)1);
//    // ... and that the request was completed successfully. Note that "ok"
//    // corresponds solely to the request for updates introduced by Finish().
//    GPR_ASSERT(ok);
//
//    // Act upon the status of the actual RPC.
//    if (status.ok()) {
//      return reply.message();
//    } else {
//      return "RPC failed";
//    }
//  }
//
// private:
//  // Out of the passed in Channel comes the stub, stored here, our view of the
//  // server's exposed services.
//  std::unique_ptr<Greeter::Stub> stub_;
//};
//
//int main(int argc, char** argv) {
//  // Instantiate the client. It requires a channel, out of which the actual RPCs
//  // are created. This channel models a connection to an endpoint (in this case,
//  // localhost at port 50051). We indicate that the channel isn't authenticated
//  // (use of InsecureChannelCredentials()).
//  GreeterClient greeter(grpc::CreateChannel(
//      "localhost:50051", grpc::InsecureChannelCredentials()));
//  std::string user("world");
//  std::string reply = greeter.SayHello(user);  // The actual RPC call!
//  std::cout << "Greeter received: " << reply << std::endl;
//
//  return 0;
//}
